I am using Display Suites. I have created a custom view mode and have made it available to the user display per Display Suite documentation, but I cannot figure out how to apply the custom view mode to the user display.  It always shows in the default view mode.

If I were editing a node, there would be a vertical tab called Display Settings that would have a field for selecting the view mode to use.  When editing an existing user profile, there is no Display Settings tab.

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In various Drupal issues cues, specifically Display Suites, Panels and Profile 2, other users have asked essentially this same question: How do I assign a custom view mode to the user profile display?  

Is the Drupal core responsible for user data and display?  Perhaps the problem lies there instead of with whatever module.